Adjustable portable lamp and lens



Oct. 24, 1950 M. c. CARLSON ADJUSTABLE PORTABLE LAMP AND LENS2'Sheets-Sheet 1 Filed March 30, 1946 INVENTOR. Marvin C. Carlson Oct.24, 1950 M. c. CARLSON ADJUSTABLE PORTABLE LAMP AND LENS 2 Sheets-Sheet2 Filed March 30. 1946 FIG.

I NVENTOR. Murvln C. (Judson Attorneys Patented Oct. 24, 1950ADJUSTABLEPORTABLE LAMP AND LENS Marvin C. Carlson, Valparaiso, Ind.,assignor to McGill Manufacturing Company, Inc., Valparaiso, Ind., acorporation of Indiana Application March 30, 1946, Serial No. 658,489

2 Claims. (01. 240102) This invention relates generally to portablelamps and in particular to a portable lamp having a reflector and lensforproviding the desired amount of illumination on a particular area.

Portable lamps having guards for protecting the bulb thereof have beenin general use in machine shops, garages and other places where a lightcapable of being handled roughly is needed. In prior art device varioustypes of reflectors have been provided associated with the guard forproviding a certain amount of directiveness to the rays from the lamp.For very precise work, lamps having lenses for directing the rays to aparticular spot have been used. However, the use of a lens with aportable lamp has not been entirely satisfactory due to the danger ofbreakage of the lens and to the likelihood of the lens becoming dirtyreducing the effectiveness thereof.

It is an object, therefore, of the present invention to provide aportable lamp which is of such construction that it will withstandroug-h usage and which will be effective to provide general illuminationof an area or to provide intense illumination of a particular smallarea.

It is a further feature of this inventionto provide a portable lampwhich is adapted for use either for general illumination o as a spotlight witha mounting therefor which permits the light to be directed asdesired.

A feature of this invention is a provision of a portable lamp having asocket adapted to receive a standard incandescent light bulb and a guardformed of heavy wire adapted to be secured to the socket to protect thebulb, the guard further serving as a mounting for a reflector and a lenswhich are adapted to cooperate with the bulb to provide either generalillumination or intense illumination of a small area as is desired.

A further feature of this invention is the provision of a portable lampwith a guard, reflector, and lens assembly and an adjustable mountingfor the lamp permitting the lamp to be installed on a fixed member andeither general or spot illumination directed as desired.

A still further feature of this invention is the provision of portablelamp having a guard and lens assembly and a mounting for the lens topermit the lens to be removably positioned on the guard and to protectthe lens from breakage.

Further objects, features and advantages of this invention will beapparent from a consideration of the following description taken inconnection with the accompanying drawings in which:

Fig. 1 illustrates the portable lamp according to this invention and atypical installation in which the lamp is applicable;

Fig. 2 is a side view of the portable lamp; 7 Fig. 3 is a front view ofthe lens assembly; and

Fig. 4 is a cross-sectional view of the lens as sembly of Fig. 3 alongthe lines 4-4. 1 In practicing my invention I provide a socke for alight bulb which is of sturdy construction and a combination g-uard,reflector and lens assembly removably secured to the socket comprising acage constructed of welded wire members having a reflector positioned onone side thereof and a lens unit removably secured to the end remotefrom the lamp socket. An adjustable mounting is provided for the socketpermitting universal movement of the lamp with respect to the support,permitting the lamp to be positioned so that general illumination fromthe reflector and the spot of light produced by the lens mayeach bedirected on any area desired.

Referring more particularly to the drawings, in Fig. 1 is shown theportable lamp ID of the invention secured to a frame member I l of abuilding in such a manner that a spot of light will be directed on avise l2 which is mounted ona work bench I 3. An alternative position ofthe lamp is shown in dotted lines in Fig. 1 with the spot of lightdirected downwards and general illumination from the reflector directedon the bench to provide a less amount of light on the vise but toilluminate a larger area adjacent the work bench.

The lamp I0 is shown in Figs. 1 and 2 as having a socket 14 adapted toreceive a light bulb I 5. The socket is shown in Fig. 2 as having aswitch with an actuating, member I6. It is pointed out that the switchneed not belocated in the socket but that the lamp could be remotelycontrolled in a well known manner. A combination guard, reflector andlens assembly is secured to said socket. For the purpose of preventingbreakage of the bulb l5, a guard is provided including a clamp unit l'ladapted to be secured to the socket I4 and a cage l8 formed oflongitudinal members l9 made of heavy wire which are welded to annularwire members 20 and to an annular ring 2| forming an open end. 'A hook22 also made of heavy wire is welded to the annular members 20 toprovide means for supporting the lamp. A reflector 23 made of thin metalwhich will retain a good polished surface is welded to the cage membersas shown. The clamp U need not be secured tightly on the socket so thatthe guard and reflector may be turned relative to the socket so thatlight can be directed by the reflector on the area desired.

The annular member 2| is adapted to receive a lens unit 24 which isshown in detail in Figs. 3 and 4. The lens unit includes an annularmounting member 25 having a lip 26 of the same outside diameter as thering 2| and a recess portion 27 with an opening 28 therein on which thelens 29 is positioned. The lens 29 has an annular oifset portion 39adapted to interfit with the opening 28. An annular securing member 3|is provided having openings 32 therein adapted to receive screws 33which are threaded into openings 34 in the mounting member. The lens isheld tightly between the securing ring 3| and the mounting 25. The lip26 is provided with recesses 35 (Fig. 3) which cooperate with screws 36threaded into the ring 2| for removably securing the lens unit to theguard. The projections have deep portions 31 which will permit the lensto be removed without completely removing the screws 36 by rotating thelens unit in a counter clockwise direction so that the portions 3'!register with the heads of the screws 36.

Referring again to Figs. 1 and 2, the mounting 38 for the lamp includesa clamping as-- sembly 39 adapted to fit into a recess 40 on the lampsocket to be adjustably positioned relative to the socket. For thepurpose of supporting the lamp from a fixed member a U-shaped bracket 4|is provided which is connected to the clamping member 39 by screws 42and which includes a screw 43 at the valley of the U to be secured to amember of a building as shown in Fig. 1 or to a work bench or othersuitable support. The screw 43 is shown in Fig. 2 as a wood screw but itis apparent that any other type of screw or bolt may be substituted forthe wood screw depending upon the material to which the lamp is to besecured.

From a consideration of the above description, it is apparent that aportable lamp is provided in which the mounting cooperates with thereflector and lens in such a way that the lamp can be adjusted toprovide illumination of either a large area or a small spot and that thelamp can be focused on any spot as desired. The mounting for the lens issuch that the lens can be easily removed if intense illumination of asmall area is not desired and the lamp and guard can be used as aportable lamp in the usual man ner. The ofiset mounting for the lensplaces the lens in a position where it will not be easily broken bycontact with tools or other objects and this mounting will absorb shockcaused by dropping the lamp also tending to prevent breaking of thelens. the surface of the guard will not pick up as much dirt and foreignmaterial as if it were on the very front of the guard and it willaccordingly require less attention in this respect.

The lens not being positioned at Although I have described what Iconsider to be the preferred embodiment of my invention, it is apparentthat various changes and modifications can be made therein withoutdeparting from the scope of the invention as defined in the appendedclaims.

I claim:

1. A guard and lens assembly for a portable electric lamp comprising aguard including a cage-like structure of heavy wires having an open endterminating in a circular ring, an angular lens mounting adapted to fitin the open end of said guard, said mounting having a first flangecooperable with the end ring of said guard and a second flange offsetfrom said first flange so as to be disposed well within said guard, alens secured to said second flange and disposed entirely within saidmounting, said lens mounting being rotatable for at least a limiteddistance relative to said guard, and locking means for securing saidfirst flange to said end ring when said lens mounting is in a givenposition relative to said guard.

2. A lens unit adapted to be positioned in an open-ended portable lampguard, such unit comprising an annular lens mounting insertable in theopen end of the lamp guard and capable of at least limited rotationrelative thereto, said mounting having an inwardly ofiset flange adaptedto be disposed well within the guard, a lens mounted on said flange anddisposed entirely within said mounting, an annular member securing saidlens to said flange, and locking means for securing said lens mountingto the guard in a predetermined relative position thereof.

MARVIN C. CARLSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 251,284 Raine Dec. 20, 1881943,792 Russell Dec. 21, 1909 1,035,623 McArthur Aug. 13, 1912 1,067,509Dietz July 15, 1913 1,088,830 Mazzeo Mar. 3, 1914 1,129,197 I-Iowes Feb.23, 1915 1,774,515 Johnson Sept. 2, 1930 2,004,183 Benjamin June 11,1935 2,404,753 Siemers July 23, 1946 FOREIGN PATENTS Number Country Date369,786 England 1932

